I have ST4 on USB and after a bit of fiddling with authorization and paths everything seems to be working ok...except
Guitars are saying ST4 MAX is not authorized. I've seen that this is a known issue and apparently resolved. I've tried installing the latest update and sounds update and then re-authorizing (offline) and still no good.
also
There are no Voices at all in the ST4 instruments browser. I'm guessing this is due to there not being a Voices folder in Instruments on the USB drive, though there is a Voices folder in Samples?
Any help much appreciated.